Chabad Knowledge Base
The Torah academy founded by Shammai was known as the “House of Shammai.” The Mishnah records 316 disagreements between the House of Shammai and the school founded by Hillel, known as the "House of Hillel." The House of Shammai generally takes the stringent view and the House of Hillel, the more lenient one. In all but 18 cases, the halachah is accordance with the House of Hillel.
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Entry for 'Beit Shammai'. Chabad Knowledge Base. https://www.studylight.org/dictionaries/eng/ckb/b/beit-shammai.html. 2012.